package com.wyyc.util;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import javax.print.DocFlavor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.util.Map;
import java.util.Random;


public class Util {

    //传入UserId写入Session
    public static void setSession(int userId,HttpServletRequest request){
        HttpSession session =request.getSession();
        session.setAttribute("userid",userId);
    }
    //销毁Session
    public static void removeSession(HttpServletRequest request){
        HttpSession session = request.getSession();
        session.invalidate();
    }
    //从Session拿到userid
    public static Integer getUserId(HttpServletRequest request){
        HttpSession session = request.getSession();
        Integer userid = (Integer)session.getAttribute("userid");
        return userid;
    }
    //检查是否登陆同时刷新Session时间
    public static boolean findSession(HttpServletRequest request){
        HttpSession session = request.getSession();
        Integer userid = (Integer)session.getAttribute("userid");
        if (userid!=null){
            session.setMaxInactiveInterval(30*60);
            return true;
        }
        return false;
    }
//
//    /***
//     * 生成加密码
//     */
//    public static String string2MD5(long x){
//        long y=x*7788;
//        return Long.toHexString(y);
//    }

//    /**
//     * 解密
//     */
//    public static long convertMD5(String inStr){
//        long y = Long.parseLong(inStr,16);
//        long x = y/7788;
//        return x;
//    }
//    public static boolean isPwd(String pwd){
//        long x = convertMD5(pwd);
//        if (x>10000&&x<100000){
//            return true;
//        }
//        return false;
//    }
    /**
     * @param url 请求链接
     * @param param 请求参数
     * @return 返回结果字符串
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                //System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" );
            //e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

//    public static String findByIp(HttpServletRequest request){
//        String ip = request.getRemoteAddr();
//        String res = Util.sendGet(FinalS.GET_IP_ADD,"ip="+ip);
//        JSONObject jsonObject = JSON.parseObject(res);
//        String data = jsonObject.getString("data");
//        JSONObject jsonObject1 = JSON.parseObject(data);
//        String city = jsonObject1.getString("city");
//        return city;
//    }

    /**
     *
     * MD5加密字符转换
     */
    public static String getMd5(String plainText) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(plainText.getBytes());
            byte b[] = md.digest();

            int i;

            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            //32位加密
            return buf.toString();
            // 16位的加密
            //return buf.toString().substring(8, 24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }

    }

    /**
     * @param url 请求链接
     * @param param 请求参数
     * @return 返回结果字符串
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Accept-Charset", "utf-8");
            conn.setRequestProperty("contentType", "utf-8");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));
//            in = new BufferedReader(
//                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     *
     * @return 返回6位验证码
     */
    public static String getVerification(){
        Random random = new Random();
        int x = random.nextInt(899999);
        x = x+100000;
        return "#code#="+x;
    }
}
